Ok, I'm just about to completely rebuild my system and here's the deal... I'd appreciate if anyone reads this and replies

6 Months ago I bought 3500+ with Asus A8N SE Motherboard. I never got the chance to fit it in as I didn't get round to buying the rest of the stuff. Now I'm going to buy a very good Antec case with the newest Enermax PSU (think it's 650w). Along with that I'm fitting in my old 6800GT with 1GB, £25 DVD RW drive, and a £150 10,000 RPM Western Digital hard disk. I'm also looking to buy a creative sound card in the price range of £50-70. I'm also going to use my old hard disk as secondary storage in a sense. To convert my old intel prescott build into this I'm looking to spend an extra £300-£400, I think this is a good upgrade without having to spend money stupidly. I'd like to know who agrees and disagrees. Thanks guys.

PS - I'm spending a lot on my case and psu so it doesn't bottleneck anything and gives maximum power and cooling to all components. Also, they will be good for future upgrades on powerful components and power hungry.